Mills was killed Sunday afternoon after he tried to stop three men from robbing his 75-year-old neighbor in the 1800 block of Third Place Southwest. The assailants stole the neighbor's Cadillac CTS and a ring from her finger.

McGee was taken into custody not long after the shooting when East Precinct police officers found a blue Hyundai Sonata that was taken in a carjacking June 11, Edwards said. They followed the car and arrested the suspect when he fled on foot. Officers found items in the car that were taken from Mills' neighbor's house, Edwards said.

McGee is being held without bond in the Jefferson County Jail.

A vigil for Mills is planned for Wednesday night at 6 p.m. at 1808 3rd Place SW.